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Yes,I too have Comcast/Xfinity and you should be able to do this...That is if your TV supports some menus,my TV is 1 yo.
What I found was by connecting the cable on the TV,then go to your TV menu guide,then select the connectivity scroll down to auto channel and run it,it may take a while to run but this should find any possible channels available.
When it completes this cycle go back to the same menu and look for show/hide channels,this part will take a while to do you have to manually select each channel to hide, what I did was hide all of the none HD and allowed only the HD one's.
By doing the auto find I now have more channels than just the standard cable connection not to mention 3X more HD channels.
Here are the steps in order I hope it helps.
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